Have you ever seen a Boeing 747-8F overtaking a MD-11 in-flight? Of course you haven’t! Till now!
Both aircraft are crossing the North Atlantic on NAT tracks, 1000′ separated from each other. The Global Supply Systems (British Airways World) Boeing 747-8F was traveling on Flight Level 310 at mach 0.84 only about 10-15kts faster than the Lufthansa Cargo MD11.